I've been interested in wide angle lately but never really tried shots wider than 12mm (24mm FOV) with the 12-35mm.

The review seems to agree that the Pana 7-14mm F4 is a very good wide angle zoom.

I'm going to the mountains and thinking I want to explore wider lens, just need to ask that if I take only one lens can the 7-14 be a walk around lens for landscape and family shots, can I at least take nice shots of family member with background of the view at long end of the zoom or it's not really practical?

Thanks,

Don't you already own a lens that can do 14mm? Like the kiit lens that came with your camera? Why don't you use it at 14mm and find out for yourself?